Circadian rhythm sleep disorder, irregular sleep wake type

This code signifies a chronic sleep disorder characterized by a lack of a consistent 24-hour sleep-wake cycle. Individuals with this condition experience highly variable sleep and wake times, often resulting in fragmented sleep, daytime napping, and difficulty maintaining a regular schedule. It is distinct from other circadian rhythm disorders by its unpredictable and non-24-hour pattern.

Apply this code when documentation clearly indicates a patient presents with an irregular sleep-wake pattern that deviates significantly from a typical circadian rhythm, leading to sleep disturbances and functional impairment. Supporting documentation should include a detailed sleep history, sleep diary, or actigraphy data demonstrating the erratic sleep-wake schedule.

• Differentiate from other circadian rhythm disorders like delayed or advanced sleep phase syndrome, which have more predictable, albeit shifted, patterns.
• Ensure the documentation specifies "irregular" sleep-wake type; avoid using for general insomnia without evidence of circadian disruption.
• Consider co-occurring conditions like neurodevelopmental disorders or dementia, which can predispose individuals to this sleep disorder.